<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script type="text/javascript">
    var a = [1, 2, 3];
    var b = a; // 对象的拷贝都是 浅拷贝，地址拷贝
    b.push(4);
    console.log('b的值', b);
    console.log('a的值', a);

</script>

</html>
